25188228 has 72 divisors (see below), whose sum is σ = 69346368. Its totient is φ = 7662528.

The previous prime is 25188187. The next prime is 25188253. The reversal of 25188228 is 82288152.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25188192 and 25188201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49825 + ... + 50327.

It is an arithmetic number, because the mean of its divisors is an integer number (963144).

Almost surely, 2^25188228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25188228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34673184).

25188228 is an abundant number, since it is smaller than the sum of its proper divisors (44158140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25188228 is a wasteful number, since it uses less digits than its factorization.

25188228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 628 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 25188228 is about 5018.7875029732. The cubic root of 25188228 is about 293.1337824377.

The spelling of 25188228 in words is "twenty-five million, one hundred eighty-eight thousand, two hundred twenty-eight".